Composition of matter.



UNITED STATES PATENT OFFIC TIIiLMAN D. LYNCH, OF WILKINSBURG ,.AND JOHN J. CRANE, OF SWISSVALE, PENNSYLVANIA,

ASSIGNORS, BY MESNE ASSIGNMENTS, TO WESTINGHOUSE ELECTRIC 8: MANUFACTURING COMPANY, OF EAST PITTSBURG, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

COMPOSITION OF MATTER.

No Drawing.

To all whom it may concern:

Be it known that we, .TILLMAN.D. LYNCH and JOHN J. CRANE, citizens of the United States,"and residents, respectively, of VVilkinsburg. and Swissvale, 'both in the county of Allegheny and State of Pennsylvania,

have invented a new and useful Improve ment in Composition of Matter, of which the following is a specification. 4

()ur invention relates to insulating ce ments, and it has for its object'to provide a sealing wax orcement which shall be adapted for rigidly securing the leads of electrical ap aratus, such astransformers, in position.

ur improved cement consists, in general, of a mixture of brick dust andresinous substances in approximately equal proportions. The specific combination of ingredients Whicli'we prefer is as follows:

Brick dust 40 parts by Weight, Powdered rosin 29 Powdered kaolin. (china ay) l 18 4: u Asphalt (high melting point) 13 receptacle, is poured into the mixture and Specifibation'of Letters Patent. Pa tented Aug. 31, 1909.

. l Application of Letters Patent filed January 10, 1908. Serial No. 410,226.

| In melting the rosin, heat should be applied gradually, care being taken to prevent the rosin from sticking to the walls of the vessel in which it is contained. -Bubbling on the surface of the mixture indicates the'prcsence of moisture and the cement should be kept in its molten state until all bubbling ceases.

The asphalt may be Cimerian gum,'hydrolene B, having a melting point of 260 F., or other suitable hydro-carbon impregnating gum. v a

\Ve claim as our invention:

1. A composition of matter-comprising ingredients in substantially the following proportions: rosin, 29 parts by Weight; brick dust, 40parts; china clay, 18 parts; and asphalt having a high melting point, 13 parts.

2. 'An insulatingcement which consists of rosin, 29 parts by Weight; gbrick dust, 10 parts; kaolin (china clay), 18 parts; hydrolene B (rn elting point 260.F.), 13 parts.

3. A composition of matter comprising ingredients in substantially the following pro- "portions: powdered rosin, 29 parts by weight; brick dust, 40 parts; powdered china clay, 18 parts, and asphalt having a high melting point, 13 parts.

In testimony whereof, we have hereunto subscribed our names'this 30th day of Docember, 1907.

Witnesses EDWIN E. NOLAN, BIRNEY Hmns. 

